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MP3308DL-LF-Z LED Driver IC Equivalent & Substitute Parts
Part Overview
The MP3308DL-LF-Z is an active-status LED Driver IC manufactured by Monolithic Power Systems Inc., configured as a single-output DC-DC Step-Up (Boost) regulator with PWM dimming capability. This device delivers 1.33A switch current at 2.2MHz operating frequency and supports output voltage up to 36V, making it suitable for backlight applications requiring high efficiency and compact integration.
Substitute parts are identified when equivalent electrical performance can be achieved within the allowed parameter ranges for this product category, maintaining compatibility with the same application class while accommodating variations in package form factor, switching frequency, and current delivery specifications.
Substiute Parts
Key Parameters
| Parameter | MP3308DL-LF-Z |
|---|---|
| Manufacturer | Monolithic Power Systems Inc. |
| Product Status | Active |
| Type | DC DC Regulator |
| Topology | Step-Up (Boost) |
| Number of Outputs | 1 |
| Voltage Supply Range | 3V to 6V |
| Output Voltage | 36V |
| Current Output / Channel | 1.33A (Switch) |
| Switching Frequency | 2.2MHz |
| Dimming Control | PWM |
| Applications | Backlight |
| Operating Temperature | -40°C to 125°C (TJ) |
| Package / Case | 14-VFDFN Exposed Pad |
| RoHS Status | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the MP3308DL-LF-Z is determined by the following critical parameters:
Primary Substitution Criteria:
- Topology: Step-Up (Boost) DC-DC Regulator
- Number of Outputs: Single output configuration
- Dimming Control: PWM-based dimming
- Application Class: Backlight LED driver
- Internal Switch: Present
- RoHS3 Compliance: Required
Secondary Compatibility Parameters:
- Input Voltage Range: Minimum 2.7V to 5.5V (accommodates the 3V-6V requirement)
- Output Current Capability: Minimum 750mA to 2.2A switch current
- Switching Frequency: 600kHz to 5.4MHz operational range
- Operating Temperature: Minimum -40°C to 85°C (accommodates the -40°C to 125°C requirement)
- Package Type: Surface mount configurations (QFN, DFN, WLCSP, DSBGA, SOT-23-6)
Substitute parts listed below meet these criteria while maintaining functional equivalence within the LED driver IC category. Variations in package size, exact frequency, and current ratings reflect design trade-offs for specific application requirements.
Parameter Comparison
| Parameter | MP3308DL-LF-Z | ADP1649ACBZ-R7 | AP5724FDCG-7 | AP5725FDCG-7 | BD60A60NUX-TR | IS31BL3506B-STLS2-TR | LM3508TLX/NOPB | LM3519MK-20/NOPB | LM3530UME-40B/NOPB | LM3553SDX/NOPB | LT3465AES6#TRPBF |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | MPS | ADI | Diodes Inc. | Diodes Inc. | Rohm | Lumissil | TI | NSC | TI | TI | ADI |
| Product Status | Active | Active | Active | Active | Active | Not For New Designs | Active | Active | Active | Active | Active |
| Topology | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) | Step-Up (Boost) |
| Voltage Supply (Min) | 3V | 2.7V | 2.7V | 2.7V | 2.7V | 2.7V | 2.7V | 2.7V | 2.7V | 2.7V | 2.7V |
| Voltage Supply (Max) | 6V | 5V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 5.5V | 16V |
| Output Voltage | 36V | 4.575V - 5.425V | Not Specified | 26V | Not Specified | Not Specified | 17.5V | 20V | 40V | Not Specified | 30V |
| Current Output / Channel | 1.33A (Switch) | 1A (Flash) | 750mA (Switch) | 750mA (Switch) | 30mA | 2.2A (Switch) | 30mA | 20mA | 30mA | 1.2A (Flash) | 225mA (Switch) |
| Switching Frequency | 2.2MHz | 1.5MHz, 3MHz | 1.2MHz | 1.2MHz | 600kHz | 1MHz | 850kHz | 5.4MHz | 500kHz | 1.2MHz | 2.4MHz |
| Dimming Control | PWM | I2C | PWM | PWM | PWM | Analog, PWM | PWM | PWM | PWM | I2C | PWM |
| Applications | Backlight | Camera Flash | Backlight | Backlight | Backlight | Backlight | Backlight | Backlight | Backlight | Backlight, Camera Flash | Backlight |
| Operating Temperature | -40°C to 125°C (TJ) | -40°C to 85°C (TA) | -40°C to 85°C (TA) | -40°C to 85°C (TA) | -40°C to 85°C (TA) | -40°C to 85°C (TA) | -30°C to 85°C (TA) | -40°C to 85°C (TA) | -40°C to 85°C (TA) | -30°C to 85°C (TA) | -40°C to 85°C (TA) |
| Package / Case | 14-VFDFN Exposed Pad | 12-WFBGA, WLCSP | 6-UDFN Exposed Pad | 6-UDFN Exposed Pad | 8-UFDFN Exposed Pad | SOT-23-6 | 9-WFBGA, DSBGA | SOT-23-6 Thin, TSOT-23-6 | 12-XFBGA, DSBGA | 12-WFDFN Exposed Pad | SOT-23-6 Thin, TSOT-23-6 |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | Not Specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) | Not Specified | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Substitutes (Active Status, ROHS3 Compliant, MSL-1):
AP5725FDCG-7 and LT3465AES6#TRPBF are the preferred substitutes for new designs. Both maintain active product status, ROHS3 compliance, and MSL-1 rating. AP5725FDCG-7 delivers 750mA at 1.2MHz with 26V output capability in a compact 6-UDFN package. LT3465AES6#TRPBF provides 225mA at 2.4MHz with 30V output in SOT-23-6 form factor, supporting extended input voltage range to 16V.
Secondary Substitutes (Active Status, ROHS3 Compliant):
LM3530UME-40B/NOPB and LM3508TLX/NOPB are active Texas Instruments devices with ROHS3 compliance. LM3530UME-40B/NOPB achieves 40V output at 500kHz in 12-DSBGA package. LM3508TLX/NOPB delivers 17.5V output at 850kHz in 9-DSBGA package with MSL-1 rating.
Conditional Substitutes (Active Status, Design Considerations Required):
IS31BL3506B-STLS2-TR carries "Not For New Designs" status and MSL-3 rating, limiting suitability for new production. LM3553SDX/NOPB supports I2C dimming control (versus PWM) with 1.2A flash current capability, requiring firmware adaptation for dimming interface compatibility.
Limited Substitutes (Specialized Applications):
ADP1649ACBZ-R7 is optimized for camera flash applications with I2C control and 1A flash current, differing from backlight-primary design. BD60A60NUX-TR delivers only 30mA output current, suitable for low-power backlight segments only.
Frequently Asked Questions (FAQ)
Q: Can ADP1649ACBZ-R7 replace MP3308DL-LF-Z in backlight applications?
A: ADP1649ACBZ-R7 is classified for camera flash applications with I2C dimming control, whereas MP3308DL-LF-Z uses PWM dimming for backlight. While both are Step-Up boost regulators, the dimming interface differs fundamentally. Substitution requires firmware modification to support I2C protocol instead of PWM control signals.
Q: What is the significance of MSL rating differences between substitute parts?
A: MSL-1 (Unlimited) rated devices like MP3308DL-LF-Z, AP5725FDCG-7, and LT3465AES6#TRPBF have no moisture sensitivity restrictions and can be stored indefinitely before reflow soldering. MSL-3 devices like IS31BL3506B-STLS2-TR and LM3553SDX/NOPB require controlled storage (168 hours maximum) and baking procedures before assembly, increasing manufacturing complexity and cost.
Q: Why do some substitutes have lower output current ratings than MP3308DL-LF-Z?
A: BD60A60NUX-TR (30mA) and LM3508TLX/NOPB (30mA) are designed for low-power backlight segments or indicator applications. These devices cannot deliver the 1.33A switch current of MP3308DL-LF-Z and are unsuitable for high-brightness LED strings. Selection must match the specific current requirement of the target LED load.
Q: Is package form factor interchangeable between substitutes?
A: No. MP3308DL-LF-Z uses 14-VFDFN package, while substitutes employ 6-UDFN, 8-UFDFN, 9-DSBGA, 12-DSBGA, 12-WLCSP, and SOT-23-6 packages. PCB layout, thermal management, and component placement differ significantly. Package selection depends on available board space, thermal dissipation requirements, and manufacturing capabilities.
Q: Which substitute offers the closest electrical match to MP3308DL-LF-Z?
A: IS31BL3506B-STLS2-TR provides the highest switch current (2.2A) among substitutes, exceeding MP3308DL-LF-Z (1.33A). However, its "Not For New Designs" status and MSL-3 rating make it unsuitable for new production. For active-status alternatives, AP5725FDCG-7 (750mA, 26V output) and LT3465AES6#TRPBF (225mA, 30V output) offer the best balance of performance and compliance.
Q: Can LM3553SDX/NOPB replace MP3308DL-LF-Z despite I2C dimming control?
A: LM3553SDX/NOPB supports both I2C and PWM dimming modes, enabling operation in PWM-only configurations if I2C interface is not utilized. However, this requires verification against specific application firmware and dimming control architecture. The device is active-status and ROHS3 compliant but carries MSL-3 rating.
Q: What output voltage considerations apply when selecting substitutes?
A: MP3308DL-LF-Z achieves 36V output, the highest among listed substitutes. LM3530UME-40B/NOPB reaches 40V, LT3465AES6#TRPBF reaches 30V, and AP5725FDCG-7 reaches 26V. Lower output voltage substitutes require proportionally higher input current to deliver equivalent LED power, affecting efficiency and thermal performance. Application voltage requirements must be verified before substitution.
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